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From: Nithin Dabilpuram <nithind1988@gmail.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: jerinj@marvell.com, dev@dpdk.org, stable@dpdk.org
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH v2 2/3] vfio: fix DMA mapping granularity for type1 iova as va
Date: Wed, 11 Nov 2020 10:38:53 +0530
Message-ID: <X6tx1CKRNpjtCdZC@gmail.com> (raw)
In-Reply-To: <2d2b628e-be4c-0abb-6fb0-9bf98d28cc26@intel.com>

On Tue, Nov 10, 2020 at 02:17:39PM +0000, Burakov, Anatoly wrote:
> On 05-Nov-20 9:04 AM, Nithin Dabilpuram wrote:
> > Partial unmapping is not supported for VFIO IOMMU type1
> > by kernel. Though kernel gives return as zero, the unmapped size
> > returned will not be same as expected. So check for
> > returned unmap size and return error.
> > 
> > For IOVA as PA, DMA mapping is already at memseg size
> > granularity. Do the same even for IOVA as VA mode as
> > DMA map/unmap triggered by heap allocations,
> > maintain granularity of memseg page size so that heap
> > expansion and contraction does not have this issue.
> > 
> > For user requested DMA map/unmap disallow partial unmapping
> > for VFIO type1.
> > 
> > Fixes: 73a639085938 ("vfio: allow to map other memory regions")
> > Cc: anatoly.burakov@intel.com
> > Cc: stable@dpdk.org
> > 
> > Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
> > ---
> 
> <snip>
> 
> > @@ -525,12 +528,19 @@ vfio_mem_event_callback(enum rte_mem_event type, const void *addr, size_t len,
> >   	/* for IOVA as VA mode, no need to care for IOVA addresses */
> >   	if (rte_eal_iova_mode() == RTE_IOVA_VA && msl->external == 0) {
> >   		uint64_t vfio_va = (uint64_t)(uintptr_t)addr;
> > -		if (type == RTE_MEM_EVENT_ALLOC)
> > -			vfio_dma_mem_map(default_vfio_cfg, vfio_va, vfio_va,
> > -					len, 1);
> > -		else
> > -			vfio_dma_mem_map(default_vfio_cfg, vfio_va, vfio_va,
> > -					len, 0);
> > +		uint64_t page_sz = msl->page_sz;
> > +
> > +		/* Maintain granularity of DMA map/unmap to memseg size */
> > +		for (; cur_len < len; cur_len += page_sz) {
> > +			if (type == RTE_MEM_EVENT_ALLOC)
> > +				vfio_dma_mem_map(default_vfio_cfg, vfio_va,
> > +						 vfio_va, page_sz, 1);
> > +			else
> > +				vfio_dma_mem_map(default_vfio_cfg, vfio_va,
> > +						 vfio_va, page_sz, 0);
> 
> I think you're mapping the same address here, over and over. Perhaps you
> meant `vfio_va + cur_len` for the mapping addresses?

There is a 'vfio_va += page_sz;' in next line right ?
> 
> -- 
> Thanks,
> Anatoly

  reply	other threads:[~2020-11-11  5:09 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20201012081106.10610-1-ndabilpuram@marvell.com>
2020-10-12  8:11 ` [dpdk-stable] [PATCH 2/2] vfio: fix partial DMA unmapping for VFIO type1 Nithin Dabilpuram
2020-10-14 15:07   ` Burakov, Anatoly
2020-10-15  6:09     ` [dpdk-stable] [EXT] " Nithin Dabilpuram
2020-10-15 10:00       ` Burakov, Anatoly
2020-10-15 11:38         ` Nithin Dabilpuram
2020-10-15 11:50         ` Nithin Dabilpuram
2020-10-15 11:57         ` [dpdk-stable] [dpdk-dev] " Nithin Dabilpuram
2020-10-15 15:10           ` Burakov, Anatoly
2020-10-16  7:10             ` Nithin Dabilpuram
2020-10-17 16:14               ` Burakov, Anatoly
2020-10-19  9:43                 ` Nithin Dabilpuram
2020-10-22 12:13                   ` Nithin Dabilpuram
2020-10-28 13:04                     ` Burakov, Anatoly
2020-10-28 14:17                       ` Nithin Dabilpuram
2020-10-28 16:07                         ` Burakov, Anatoly
2020-10-28 16:31                           ` Nithin Dabilpuram
     [not found] ` <20201105090423.11954-1-ndabilpuram@marvell.com>
2020-11-05  9:04   ` [dpdk-stable] [PATCH v2 1/3] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-11-05  9:04   ` [dpdk-stable] [PATCH v2 2/3] vfio: fix DMA mapping granularity for type1 iova as va Nithin Dabilpuram
2020-11-10 14:04     ` Burakov, Anatoly
2020-11-10 14:22       ` [dpdk-stable] [dpdk-dev] " Burakov, Anatoly
2020-11-10 14:17     ` [dpdk-stable] " Burakov, Anatoly
2020-11-11  5:08       ` Nithin Dabilpuram [this message]
2020-11-11 10:00         ` [dpdk-stable] [dpdk-dev] " Burakov, Anatoly
     [not found] ` <20201201193302.28131-1-ndabilpuram@marvell.com>
2020-12-01 19:32   ` [dpdk-stable] [PATCH v3 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-01 19:33   ` [dpdk-stable] [PATCH v3 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20201202054647.3449-1-ndabilpuram@marvell.com>
2020-12-02  5:46   ` [dpdk-stable] [PATCH v4 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-02 18:36     ` David Christensen
2020-12-02  5:46   ` [dpdk-stable] [PATCH v4 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
2020-12-02 18:38     ` David Christensen
     [not found] ` <20201214081935.23577-1-ndabilpuram@marvell.com>
2020-12-14  8:19   ` [dpdk-stable] [PATCH v5 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-14  8:19   ` [dpdk-stable] [PATCH v5 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20201217190604.29803-1-ndabilpuram@marvell.com>
2020-12-17 19:06   ` [dpdk-stable] [PATCH v6 1/4] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2020-12-17 19:06   ` [dpdk-stable] [PATCH v6 2/4] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20210112173923.30320-1-ndabilpuram@marvell.com>
2021-01-12 17:39   ` [dpdk-stable] [PATCH v7 1/3] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2021-01-12 17:39   ` [dpdk-stable] [PATCH v7 2/3] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
     [not found] ` <20210115073243.7025-1-ndabilpuram@marvell.com>
2021-01-15  7:32   ` [dpdk-stable] [PATCH v8 1/3] vfio: revert changes for map contiguous areas in one go Nithin Dabilpuram
2021-03-05  7:50     ` David Marchand
2021-03-05 13:54       ` Burakov, Anatoly
2021-03-05 15:50         ` [dpdk-stable] [dpdk-dev] " Nithin Dabilpuram
2021-04-01 11:27           ` Burakov, Anatoly
2021-01-15  7:32   ` [dpdk-stable] [PATCH v8 2/3] vfio: fix DMA mapping granularity for type1 IOVA as VA Nithin Dabilpuram
2021-01-15  7:32   ` [dpdk-stable] [PATCH v8 3/3] test: change external memory test to use system page sz Nithin Dabilpuram
2021-02-11 11:21     ` Burakov, Anatoly

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